Figure 5.

Droplet digital polymerase chain reaction (ddPCR) sensitivity of detection in patients with consecutive negative results (patients 47–53) and negative specimens collected from known positive patients (patients 54–57). ddPCR copies are shown for the N1 target. Note that a sputum sample was used in patient 51. Abbreviations: Ct, cycle threshold; ID, identifier; NA, clinical information not available; Neg, negative result with standard-of-care reverse-transcription polymerase chain reaction (RT-PCR); Pos, positive result with standard-of-care RT-PCR, with no available Ct value.